Filtering apparatus

Abstract

A filtering apparatus for filtering cutting oil containing metal chips so that the filtered cutting oil can be recycled includes a reservoir, a filtering drum journalled within the reservoir and having a filtering screen support and a filtering screen extending about the periphery of the drum and secured to the drum by the filtering screen support, a chip discharge device including a belt entrained around guide rollers for carrying separated metal chips out of the reservoir, a discharged chip receiving bin disposed outside the reservoir adjacent to the discharge end of the chip discharge device and a filtered oil receiving bin disposed outside of the reservoir adjacent to a filtered oil discharge area of the reservoir. The drum is rotated by a motor located atop the reservoir and connected to the drum. An air spray device extends within the drum for spraying air at the filtering screen to dislodge any metal chips clinging to the screen.

What is claimed is: 
     
       1. A filtering apparatus for filtering cutting oil containing metal chips, said apparatus comprising: an oil reservoir having a rectangular cross section, opposed end walls, one of which end walls has an oil inlet extending therethrough and through which oil inlet cutting oil is introduced into the reservoir and the other of which end walls has a chip discharge opening extending therethrough and through which chip discharge opening metal chips are discharged out of the reservoir, opposed side walls extending between said end walls and one of which side walls has an oil discharge opening extending therethrough, and a bottom wall extending between said end walls;   a filtering drum rotatably mounted within said reservoir,   said drum comprising a filtering screen extending about the periphery thereof for filtering cutting oil containing metal chips;   an annular rotary member secured to said drum so as to rotate therewith, said annular rotary member journalled in said discharge opening;   a rotary shaft journalled in the other of said side walls and rotatably supporting said drum with said annular rotary member;   drive means operatively connected to said shaft for rotating said shaft to rotate said drum; and   chip discharge means disposed in said reservoir and extending through said chip discharge opening for discharging metal chips disposed adjacent said bottom wall of said reservoir from said reservoir through said chip discharge opening.   
     
     
       2. A filtering apparatus as claimed in claim 1, wherein said drive means comprises a motor disposed on the outer surface of said reservoir and having an output shaft, a first sprocket connected to said output shaft, a second sprocket disposed outside said reservoir and connected to said rotary shaft, and chain extending around said sprockets.   
     
     
       3. A filtering apparatus as claimed in claim 1, wherein said chip discharge means is a conveyor comprising a belt having upper and lower runs extending between said filtering drum and the bottom wall of said reservoir and through said chip discharge opening, and a plurality of guide rollers around which said belt is reeved,   at least some of said guide rollers disposed in said reservoir and extending between and journalled to the side walls of said reservoir.   
     
     
       4. A filtering apparatus as claimed in claim 1, and further comprising a filtered oil bin disposed outside of said reservoir in communication with said oil discharge opening for receiving filtered oil pouring out from said discharge opening.   
     
     
       5. A filtering apparatus as claimed in claim 4, and further comprising air spraying means extending within said drum for directing a spray of air at said filtering screen that impinges said screen at a location thereon defined above a top end of said oil bin.   
     
     
       6. A filtering apparatus as claimed in claim 1, and further comprising air spraying means extending within said drum for directing a spray of air at said filtering screen that impinges said screen at a location thereon defined at least at the same level with said oil inlet.